Application:W32/WinVNC is a remote administration utility program for use in observing or administering a remote machine.
Though legal, usage of this program may be considered unlawful in certain jurisdictions, if it is used to manipulate a computer without the knowledge and/or authorization of the machine's primary user.
Like backdoor programs, WinVNC comprises of two components: a server and a client. To control a remote computer, the server component must be installed on the targeted machine. This may or may not be done with the authorization of the computer's primary user.
Once the server component is installed on the targeted machine, an authorized administrator (or attacker) can use the client component to communicate with it, and in turn observe and control the computer.
Note: an icon may be displayed on the computer to indicate the presence of the server component; the icon may however be disabled.